Facebook.com/BritneySpearsBritney Spears is about to start recording her new album with executive producer will.i.am, but in the meantime, we can listen to "Ooh La La," the song she's recorded for the soundtrack of the upcoming movie The Smurfs 2.

The song has apparently leaked and is now online, and it's super-poppy, sweet and upbeat, which is appropriate for a kids' movie. It was co-written by longtime Katy Perry collaborators Dr. Luke and Bonnie McKee -- Katy plays Smurfette in the movie, as it happens. Luke and McKee were also behind Britney's massive hit "Hold It Against Me."

In other Britney news, she's celebrating the fact that Thursday marked the 13th anniversary of the release of her sophomore album, Oops...I Did It Again, which debuted at #1 and has gone on to sell some 20 million copies.

"'Oops...' is now a teenager, my goodness. Happy 13th!," Britney wrote on Facebook, posting a photo of the album cover. On Twitter, she wrote, "can't believe it's been 13 years since the Oops album came out... Holy moly!" She added a link to an Instagram photo: a close-up of her face from the "Oops" video.